export function with_backoff(apiCall: any, retryCount?: number, lastError?: any): any;
export class RetryableError extends Error {
    constructor(message: any);
    retryable: boolean;
}
export class ValidationError extends Error {
    constructor(message: any);
    stack: string;
}
export function validate_strings(s: any, param_name: any): boolean;
export function delay(retryCount: any): Promise<any>;
export function sleep(ms: any): Promise<any>;
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